week 4.docx - Define the steps on a growth curve and...

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Define the steps on a growth curve and discuss where antibiotics might be the most effective. ************************************************************************************************* Lag Phase: This is the initial phase. “cellular activity but not growth”. A small group of cells are placed in a nutrient rich medium that allows them to synthesize proteins and other molecules necessary for replication. These cells increase in size, but no cell division occurs. Exponential (Log) Phase: After the lag phase, bacterial cells enter the exponential or log phase. This is the time when the cells are dividing by binary fission and doubling in numbers after each generation time. Metabolic activity is high as DNA, RNA, cell wall components, and other substances necessary for growth are generated for the division. This is the growth phase that antibiotics and disinfectants are most effective because these substances target bacteria cell walls or the protein synthesis processes of DNA transcription and RNA translation.

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